Cheatcode 
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During play press 'P' to pause the game.  Now hold down the left mouse
button and press 'F1'.  The background should change to green.  Now
unpause the game and use 'N' to advance levels.  To shut the cheat off
repeat the previous instructions.

Start level one, take out the disk and insert disk number 2.  Let all
your time run out and after the chest bursting bit you are taken to a
much later level, no matter what the brief says!  On the level after
this one, at the top right before the exit, there is a platform full
of medipacks. Climb the ladder that seems to go nowhere. On the level
after that, go to the bottom left for full everything.

 
 
